<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>button标签</title>
</head>

<body>
    <!-- form 表单区域 -->
     <!-- action 发送数据的地址 -->
    <form action="">

        用户名: <input type="text"><br>
        密码：<input type="password"><br>
<!-- 如果省略type 属性 功能是提交 -->
        <button type="submit">提交</button>
        <button type="reset">重置</button>
        <button type="button">按钮</button>
    </form>

</body>

</html>